In Omaha, hardly a barrier? (2-2)

I believe the answer is:

ha-ha

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(Other definitions for ha-ha that I've seen before include "Sunk ditch - laugh!" , "Sunken boundary wall" , "Ditch with wall in it - sounds hilarious" , "Kind of ditch with wall in it" , "Sunk fence" .)

I've seen this clue in the Evening Standard.

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